*{
    margin: 0;
    padding: 0;
}
nav{
    
    width: 100%;
    background-color: #212121;
    position: relative;
}
.logo{
    margin-left: 76px;
    margin-top: 10px;
}
a{
    text-decoration: none;
    color: white;
}
ul{
    margin-left: 439px;
    margin-top: -40px;
    height: 66px;
}
li{
    float: left;
    list-style: none;
    margin-left: 30px;
}
.zhuce{
    position: absolute;
    margin-left: 300px;
    margin-top: -10px;
}
.denglu{
    margin-left: 200px;
    margin-top: -10px;
    position: absolute;
}
.lingdang{
    margin-top: -30px;
    position: absolute;
    margin-left: 420px;
}
.xiaoxi{
    margin-top: -30px;
    position: absolute;
    margin-left: 500px;
}
.head2{
    margin-top: -15px;
    position: absolute;
     margin-left: 600px;
     border-radius: 50%;
    width: 70px;
    height: 70px;  
}
.xlk{
    position: absolute;
    margin-left:925px;
    top: 105px;
    width: 150px;
    height: 160px;
    background-color: white;
    display: none;  
    transition: all 2s;
    z-index: 5;
}
.xlk>div>p{
    display: block;
    width: 100%;
    height: 40px;
    margin-left: 40px;
    padding-top: 3px;
}
ul>.bigbox:hover .xlk{
    display: block;
}
.xlk>.p1:hover{
    background-color: green;
}.xlk>.p2:hover{
    background-color: green;
}
.xlk>.p3:hover{
    background-color: green;
}
.xlk>.p4:hover{
    background-color: green;
}
section{
    background-image: url(../img/作业2/bg.jpg);
    width: 100%;
    height: 1452px;
    position: relative;
} 
.dhz{
    width: 878px;
    height: 1350px;
    background-color: #ffff;
    top: 40px;
    position: absolute;
    left: 400px;
} 
.dhz>.dh>span{
    font-size: 25px;
}
.zhdl{
    background-color: #e3e3e3;
    height: 75px;
    width: 438px;
    position: absolute;
}
.dh>.zhdl>a{
    position: absolute;
    left: 150px;
    top: 20px;
    color: black;
}
.zczh{
    position: absolute;
    left: 600px;
    top: 20px;
    height: 75px;
    width: 438px;
}
.zczh a{
    position: absolute;
    color: black;
}
.zh{
    margin-top: 200px;
    font-size: 20px;
    margin-left: 40px;
}
.zh>div>input{
    width: 800px;
    height: 30px;
}
.mm{
    margin-top: 50px;
    font-size: 20px;
    margin-left: 40px;
    color: red;
}
.mm>div>input{
    width: 800px;
    height: 30px;
}
.xb{
    font-size: 20px;
    margin-left: 40px;
    margin-top: 30px; 
}
.jzd{
    margin-left: 40px;
    margin-top: 30px;
    font-size: 20px;
}
.grjj{
    margin-left: 40px;
    margin-top: 30px;
}
.grjj>textarea{
    width: 800px;
    height: 300px;
}
/* .jzmm{
    margin-left: 40px;
    margin-top: 10px;
    font-size: 20px;
} */
.denglu{
    margin-left: 50px;
    margin-top: 100px;
    margin-top: 250px;
}
.denglu>button{
    display: block;
    width: 724px;
    height: 55px;
    background-color: #81d867;
    color: white;
    font-size: 30px;
}
.yzm{
    font-size: 20px;
    margin-left: 40px;
    margin-top: 50px;
}
.yzm>input[type="text"]{
    width: 400px;
    height: 50px;
}
.yzmtp{
    height: 50px;
    margin-left: 500px;
    margin-top: -40px;
}
.zx{
    margin-top: 170px;
    margin-left: 40px;
}
.zx>span{
    color: green;
    margin-left: 10px;
    padding-left: 10px;
}
footer{
    height: 276px;
    width: 100%;
    background-color: #2e2e2e;
}
.xz{
    display: grid;
    grid-template-rows:repeat(3,1fr) ;
    grid-template-columns: repeat(5,1fr);
    width: 600px;
    height: 200px;
    color:white;
    position: absolute;
    margin-top: 67px;
    margin-left: 30px;
}
.yx{
    position: absolute;
    margin-left: 1200px;
    margin-top: 100px;
}